PURPOSE: To reinforce an optical fiber core connection part securely in a short time by running the optical fiber core connection part in a reinforcing pipe made of a hot-melt adhesive material having an incorporated inductive heating body, setting them in a mold wherein an inductive heating device is incorporated, and allowing the inductive heating body to heat up, and thus melting the reinforcing pipe.
CONSTITUTION: Wires 7 are connected together by a discharge melt-sticking method and a reinforcing pipe 1 and an auxiliary pipe 6 equipped previously to one optical fiber core 5 are moved to the connection part of the optical fiber core 5; and the auxiliary pipe 6 is positioned at the optical fiber wire 7, and the reinforcing pipe 1 is positioned at the optical fiber core 5. Then, this optical fiber 5 equipped with the reinforcing pipe 1 and auxiliary pipe 6 is set in a mold 9. In this state, a high frequency current is flowed through an induction coil 17 to establish a high frequency magnetic field in a molding cavity 12, allowing an inductive heating body 3 to heat up. This heating melts the reinforcing pipe 1 and auxiliary pipe 6 to form a reinforced coating layer 18 composed of thermal hot-melt materials and the inductive heating body 3 at the connection part of the optical fiber core 5.
YAMAKAWA SHINZOU
HOSHINO MITSUTOSHI
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